package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtil;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandler.GuLiException;
import com.google.gson.Gson;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.HashMap;

@Api(description = "微信api调用")
//@CrossOrigin
//只是请求数据，不需要返回数据
@Controller//@RestController：1、创建对象交给spring管理，2、数据返回
@RequestMapping("/api/eduCenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //1、生成微信扫描二维码
    @ApiOperation(value = "生成微信扫描二维码")
    @GetMapping("/login")
    public String getWxCode() {
        //请求微信地址
        //固定地址，后面拼接参数
        /*String url = "https://open.weixin.qq.com/" +
                "connect/qrconnect?appid=" + ConstantWxUtil.WX_OPEN_APP_ID + "&response_type=";*/

        // 微信开放平台授权baseUrl  %s相当于？代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
        "?appid=%s" +
        "&redirect_uri=%s" +
        "&response_type=code" +
        "&scope=snsapi_login" +
        "&state=%s" +
        "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirect_url = ConstantWxUtil.WX_OPEN_REDIRECT_URL;
        try {
            redirect_url = URLEncoder.encode(redirect_url, "utf-8");
        }catch (Exception e) {

        }

        //设置%s里面的值
        String url = String.format(
                baseUrl,
                ConstantWxUtil.WX_OPEN_APP_ID,
                redirect_url,
                "atguigu"
        );

        //重定向到请求微信地址
        return "redirect:" + url;
    }

    //2、仅学习阶段：获取扫描人信息，添加数据
    @ApiOperation("仅学习阶段：获取扫描人信息，添加数据")
    @GetMapping("/callback")
    public String callback(String code,String state) {
        try {
            //1、获取code值，临时票据，类似于验证码

            //2、拿着code，请求微信固定地址，得到两个值 access_token 和 openid
            String accessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数：id 秘钥 和 code值
            String.format(
                    accessTokenUrl,
                    ConstantWxUtil.WX_OPEN_APP_ID,
                    ConstantWxUtil.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的值，得到两个返回值 access_token 和 openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值
            //把accessTokenInfo字符串转换map集合，根据map集合里面的key获取对应值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");

            //把扫码人的信息添加到数据库里面
            //判断数据库表里是否存在相同信息，根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            //member是空，表没有相同微信数据，进行添加
            if (member == null) {
                //3、拿着access_token 和 openid，再去请求微信提供的固定地址，获取到扫码人的信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                String resultUserInfo = null;
                try {
                    //发送请求
                    resultUserInfo = HttpClientUtils.get(userInfoUrl);
                } catch (Exception e) {
                    throw new GuLiException(20001, "获取用户信息失败");
                }
                //解析json
                HashMap<String, Object> mapUserInfo = gson.fromJson(resultUserInfo, HashMap.class);
                String nickname = (String)mapUserInfo.get("nickname");//昵称
                String headimgurl = (String)mapUserInfo.get("headimgurl");//头像

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //member非空，表有相同微信数据，不进行添加

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token" + jwtToken;
        }catch (Exception e) {
            throw new GuLiException(20001, "登陆失败");
        }
    }

}
